CentOS 5 :: Xen VM - Multi Core CPU VS Multi CPUs?
Sep 12, 2011
Im running 64bit centos 5.6 and using virt-manager.On one of my guest OS's, Windows 7, The max Physical CPUs is 2, you can have unlimited CPU Cores however. (like my machine i use for work has 1, 4 core processor).The issue im having is xen only allows you to set the vcpu arguemnet in your xen config file. How can i set it so that 1 CPU has several Cores just as windows would recognize this machine if i were installing directly to the hardware vs via a VM.Ive searched for 2 days staright trying to address this issue, very little progress, Does anyone know where a XEN support forum is? all i get is the citrix xen support forums.
here is the best info i have found on this, but i dont know how to change this for my CPU to work, when i enter this in my xen config it essentially ignores it and just takes the value of vcpu= so windows shows 2 CPUs each with ONLY one core. Id like 1 or 2 CPUS showing Several cores.The physical Hardware is 2x Xeon 5300 Quad Core CPUs.
> # Expose to the guest multi-core cpu instead of multiple processors
> # Example for intel, expose a 8-core processor :
> #cpuid=['1:edx=xxx1xxxxxxxxxxxxxxxxxxxxxxxxxxxx,[code]........
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Mar 27, 2011
I have a command line OCR program called OCR Shop XTR (Vividata corp) that I am using on a system with a 6-core AMD chip. I changed the bios so that the 6-cores were activated, but htop shows me that while the program is running, I am only getting activity on one core (the program maxes out the one core with consistent usage between 97% and 100%).
I have read that many programs are not written to take advantage of multiple core cpu's. However, I am just hoping that there is some way to get this program to take advantage of the extra cores. Does anyone know of a way to invoke programs from the command line which would spread the workload out among additional cores?
Here is the output of uname -a:Linux linux 2.6.37.1-1.2-desktop #1 SMP PREEMPT 2011-02-21 10:34:10 +0100 i686 athlon i386 GNU/LinuxAnd here is the output for one of the cores from cat /proc/cpuinfo:processor : 5
vendor_id : AuthenticAMD
cpu family : 16
model : 10
model name : AMD Phenom(tm) II X6 1100T Processor
stepping : 0
[Code].....
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Oct 31, 2010
Is there any Linux API that will let me control on what core will a thread run? If not, do I have to use assembly language?
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Jun 24, 2011
I have an ATI Radeon HD 3300 on-board video chipset, and an ATI Radeon HD 4350 PCI card. What I want is to have both displays available from one mouse/keyboard. I want to play media on one and have the other as my main desktop.The problem is that with Xinerama enabled, KDE desktop effects do not work (KDE says XComposite and XDamage are not available, even though I explicitly enabled them as extensions in the xorg.conf file), and performance is quite bad. Without Xinerama enabled, performance is great, desktop effects work great, but there's a lot of trouble with full-screen video, and the KWin window manager does not apply in the second display (although I can run a second instance of KWin on :0.1).
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Mar 21, 2011
Anyone successfully using VNC client on a Mac to control a Debian server?I have the vncserver setup on the Debian machine properly. But I'm having problems connecting to it from both a PowerMac running Tiger and a MacBookPro running leopard.I can connect no problem from a machine running Slack12.2, have not setup port forwarding on my router to connect remotely yet.My Debian machine is running the latest stable release of squeeze with KDE4.I originally tried this with RealVNC Enterprise for OSX but I'm not gonna buy it so I need another alternative after the 30 day trial ends as they have no free version for OSX.
The situation is that I do freelance graphic design on the PowerMac with Cinema4D and Photoshop so I spend most of my time on that machine which is located in my home studio in my attic. Aside from the MacBook and a Dell desktop(family machine)all my other machines and network hardware are in the basement. So to go from the attic to the basement everytime I need to do something on another machine is not practical, and the only other machine I need to access on a regular basis is the Debian box in the basement, this makes the most sense.
I also have a 14 year old living in the house and he's fascinated by all this and will meddle in anything he gets the chance to so all the Linux machines and network hardware need to be behind lock and key.
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Mar 13, 2009
Many people have multi-core cpus supporting frequency scaling now, if you want to see if the workload is being evenly distributed then add as many CPU Frequency Scaling Monitor applets to the Gnome panel as you have cores/cpus. Then right-click each one and select preferences and choose which cpu to monitor.
Now compile a large program or run a cpu intensive game and watch how the workload dances around between the two (hopefully)
Some clever apps like gnome chess will multi-thread and make max use of both cores, sadly many others won't.
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Sep 14, 2009
I've tried searching the forums / google and haven't been able to come up with anything... in Debian-based distros there's an option that can be set to allow boot concurrency so that multiple processor cores can be used for the boot process. Windows also has an option similar to this to specify how many processor cores to use for boot.
Is there an option for multi-core booting in Fedora?
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Sep 9, 2011
I need to set the CR4.MCE bit for all the cores on my system (4). I'd like to write a linux kernel module for that, but I am not sure how to proceed: How do you sequentially access all of the CR4 registers? I have read the Intel manuals and they describe a way to initialize each core, but this is done in the bios.
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Sep 17, 2010
Now that Ubuntu 10.04 has multi-touch capabilities built-in, if I do not have a multi-touch screen or surface device, can I get 2 USB mice and get 2 pointers on the screen? One for the right hand and one for the left hand as I am ambidextrous, and would find it very convenient to have 2 mice.
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Apr 11, 2011
I have written a simple script which has to find required patterns from a bunch of files ( where each file is around 2 GB each,which contain the output of seq 1 10000000000000) on an 8 core machine.I am current forking 6 child processes which run simultaneously on 6 cores of the processor & have to search for the required pattern in 6 different files & inform the parent process when a pattern is found using a PIPE.
The problem is,when a child process is done reading a text file looking for a pattern,it is becoming a zombie process.It exits cleanly when i put a $SIG{CHLD} = "IGNORE"; in the script.Can any one tell me whats going on & how do i improve the communication between child and parent processes?
Code:
#!/bin/perl
use strict;
[code]...
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Nov 11, 2010
I have installed OpenSuse 11.3 32 Bit in a virtual machine on an older computer on a Windows XP host and on a new computer with AMD Phenom II X4 965 processor.
With sysbench I tested the performance of mutex and on the new computer it is 3 - 4 times slower than on the virtual machine. Other performance tests with sysbench for CPU, memory and threads are faster on new computer like expected. I tested this, because I have a slower performance of table creation in MySql tested with sql-bench, where creation of 10000 tables lasts 45 seconds on the virtual machine but over 400 seconds on the new computer.
I have tested with kernel-desktop and kernel-default but there are not large differences. File creation was tested with bonnie++ and is on newer computer faster as expected.
My questions are:
- Why is the mutex handling on the multi core CPU slower than in the virtual machine and how to speed up this?
- Or is there another reason why table creation of MySql is so much slower on multi core CPU?
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Feb 19, 2010
In my Open-Suse server I have a script, where makepasswd output(by default it generates similar passwords: cGyTbqpr, tpJ1LA, 33EXdo) is redirected to mkpasswd(which uses DES by default) in order to generate salted hash of this previously generated password. I would like to test the strength of this system. I have a quad core CPU, and if I start John The Ripper like this(I want to use -incremental:all flag):
john -incremental:all passwd
..only one core is utilized at 100%. Is there a possibility to make all four cores to crack this password? Or is this possible only after reprogramming John The Ripper? Or what is the algorithm for generating passwords with with -incremental:all flag? I mean if John generates passwords randomly in brute-force mode, then it's smart to start four different John processes simultaneously because then one of those four will find the password firs
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Aug 20, 2010
I've been doing some computations at home and at work and have noticed some unexpected performance issues. The work machine is quite a bit more "serious" than the home machine, but sometimes the home machine outperforms the work machine. I'm curious what the dynamic is -- why this should be, and if I can tweak it at all.
Ultimately on both machines the computations are just a lot of very large arbitrary-precision integer linear algebra computations (based on the GNU multi-precision library). Reducing a lot of sparse but "large" integer matrices, finding the vertices on the boundary of high-dimensional polyhedra, and so on.
On my home computer (which has two cores), if I run a standard computation on only one core (the 2nd core near-idle), it takes 282s.
On the home computer running two identical parallel computations (the same computation as above), it takes approx 320s on each core.
On my office computer, with all cores essentially idle except for one core running this computation, it takes 196s.
On my office computer, if I have all 8 cores running full-out, and one of the cores is doing the computation above, it takes 356s on the one core that's running the computation.
Here are the details on my home computer:
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Jan 25, 2011
I will be relocating to a permanent residence sometime in the next year or two. I've recently begun thinking about the best way to implement a home-based network. It occurred to me that the most elegant solution might be the use of VM technology to eliminate as much hardware and wiring as possible.My thinking is this: Install a multi-core system and configure it to run several VMs, one each for a firewall, a caching proxy server, a mail server, a web server. Additionally, I would like to run 2-4 VMs as remote (RDP)workstations, using diskless workstations to boot the VMs over powerline ethernet.The latest powerline technology (available later this year) will allow multiple devices on a residential circuit operating at near gigabit speed, just like legacy wired networks.
In theory, the above would allow me to consolidate everything but the disklessworkstations on a single server and eliminate all wired (and wireless) connections except the broadband connection to the Internet and the cabling to the nearest power outlets. It appears technically possible, but I'm not sure about the various virtual connections among VMs. In theory, each VM should be able to communicate with the other as if it was on the same network via the server data bus, but what about setting up firewall zones? Any internal I/O bandwidth bottlenecks? Any other potential "gotchas", caveats, issues? (Other than the obvious requirement of having enough CPU and RAM).Any thoughts or observations welcome, especially if they are from real world experience in a VM environment. BTW--in case you're wondering why I'm posting here, it's because I run Debian on all my workstations/servers (running VirtualBox as a VM for Windows XP on one workstation).
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Jun 4, 2010
In my environment all the servers are having more than 5+ cpu's.Please help me to find out from which CPU the OS is booting
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Oct 24, 2010
I've got a bit of a question. My network is laid out like this:
The role assignments are thus:
Firewall - sorts out the passing through to the 3 different networks, and acts as the traffic proxy.
Windows 2003 server - Does Active Directory and DNS
CentOS server - FTP and DHCP
Now, my problem is I need the CentOS server to be able to assign IP address to both networks, however, the CentOS server can *ONLY* be connected via the one interface to the firewall. It needs to assign the Windows 2003 server and the eth0 of the firewall an IP address via static DHCP, but it also needs to able to assign the clients dynamically via any address in the 10.23.1.0/24 range. I was thinking that I would be able to create static only assignments for the servers via their MAC addresses, and only have 1 dynamically assignable entry for the clients, and then get the firewall to allow ports 67 and 68 to flow freely between eth0 and eth1, but I wasn't entirely sure of the best way to do all this.
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Aug 12, 2009
How To: Load Balancing & Failover With Dual/ Multi WAN on Linux proxy server I have 3 WANs connection (2 ADSL and 1 Wimax). And 30 clients on LAN.
eth0 connect with Wimax
ip= 172.23.x.x
eth1 connect with ADSL1
ip=10.10.6.x
eth2 connect with ADSL2
ip= 10.10.5.x
eth3 connect with LAN
ip=192.168.1.x
how to do Load Balancing & Failover With Dual/ Multi WAN on Linux proxy server.
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May 9, 2010
I have just purchased an AMD Phenom II 1055T 6 Core CPU to replace my aging CPU. The problem is only 1 core is visible to Ubuntu, Does it actually support 6 cores?
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Jun 23, 2010
I'm using Ubuntu 10.04 x64, and I have an AMD Phenom 2 x4 940 CPU. First I have to underline that four cores worked perfectly in previous versions of Ubuntu as well as Windows.
When looking at system monitor it tells me that I have two CPUs/Cores, it should be four.
This is the output of CPU info:
Code:
processor: 0
vendor_id: AuthenticAMD
cpu family: 16
model: 4
[Code].....
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May 1, 2010
I have fresh install of Ubuntu 10.04 LTS Added Wine from Software Center but have no any Win apps loaded or running yet. I have also enabled visual Effects and the system installed and enabled NVidia's driver for the video-card after which the picture quality improved.
Here is the screen of my CPU monitor (sorry labels arre in Russian but the charts are quite intuitive) As you can see this 100% load "jumps" from one core to another periodically. On the Processes tab there is nothing fancy:
Less than 10% processes load. I have tried to play with CPU Clock Gnome widget, it doesn't really change the picture whether I use MAX CPU clock of 2Ghz or reduced power-saving 1,2 GHz. I have found couple similar cases on forum but see no solution so far.BTW, I have already launched the update manager and currently Ubuntu does not offer any new updates.
[code]....
PS. In the attachement - Report of some built in System Diag Tool
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Jan 22, 2010
I am putting together some new systems for my customer and I'm having some trouble with a script that we use to back up files to a DVD R. The problem is that I can't write a 2nd session to the DVD unless I eject the disk and reload it. The drives are slimline type drives, Sony BD-5730S and Teac DV-W28S-V93, so they won't reload without human intervention. Opsys is CentOS 5.4 or RHEL 5.4. I've tried both AMD and Intel based mother boards. If i try this on Fedora 11 or 12 it works fine. This works on IDE attached drives but not a SATA attached drives. Fedora appears to use something called genisoimage instead of mkisofs. I can't get genisoimage to run on CentOS or RHEL.
Here's the code to setup the test files:
rm -f /tmp/BDtest/*
mkdir /tmp/BDtest
dd if=/dev/zero of=/tmp/BDtest/blank.iso bs=10M count=1
for NUM in {1..160}
[Code].....
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May 17, 2010
I searched around and it seems like other people are having similar issues with multi-touch on Lucid, although my specific problem hasn't been brought up. I have an Eee PC 900A that I upgraded from 8.10 to 10.04. In 8.10, two-finger tapping was processed as a middle click, and two finger scrolling worked perfectly with the other functions.
After upgrading to 10.04, a two-finger tap is now the same as a right click, and middle click is three-finger tap. There does not seem to be any place in the touchpad settings to adjust this.
What's more, if I enable two-finger scrolling in the touchpad settings, the two-finger tapping suddenly stops working. If is change scrolling to edge or disabled, the multi-finger tap functionality comes back again. Has anyone else had this problem? Is there a solution?
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Dec 29, 2010
I-ve just bought a new hard disk and i wonder what is the best way to do a multi-partition
So my set of drives is:
120Gb - sata
1Tb - sata2
I was thinking to do like this:
1st partition - Slackware Main OS
2nd partition - Arch Linux
3rd partition - /home
4rd partition - swap
5th partition - wind0ws Gaming only
the 120Gb hard drive i intend to do a /home2 for movies, etc. Is that order above the best or i could make swap as 2nd partition
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Oct 21, 2010
Is it possible to chain together multiple SSH tunnel hops in a single `ssh -L` command on the client side? I have two gateways I need to get through in order to access a remote host. For a normal SSH client connection, it's simple enough chain this all together by simply appending the additional SSH connection commands to the first one:Code: ssh gateway.1 ssh gateway.2 ssh remote.host.
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Mar 6, 2010
Well this pretty much sums up the experience with Slackware current these days. This is not to say it was all plain sailing. So what problems were there?
1) Nvidia drivers did not work, this was fixed by re-compiling the kernel modules and installing a patched or beta driver, but it introduced another fault. However this problem cannot be accredited to Slackware, all operating systems have driver problems after being updated. Nvidia however had a new version out in a couple of days, which completely fixed the problem.
2) The problem introduced by the hacked fix of the older Nvidia driver wouldn't allow me to switch to the generic kernel (it would not create a valid initrd.gz). I think this was because of re-compiling the kernel modules, so I re-installed them and the problem was fixed. Again not a Slackware fault but a samac fault.
3) Program A couldn't find library B. Slackware has moved some libraries from e2fsprogs to util-linux-ng. This may cause some stuff to break if you are using the multi-lib extensions. This was fixed by creating a compat32 package for util-linux-ng. Again not actually Slackwares fault, but a little closer to home. Alien Bob could you update the massconvert.sh please.
That's it so far, after an update that ran to over 500 lines in the change log, an updated kernel, updated glibc, updates X server etc. etc. and three paltry problems none of which could be attributed to Slackware directly.
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Apr 29, 2011
I'm using Slackware 13.1_64 with multi-lib. Now that 13.37 is out I would like to upgrade my system but thought I would ask if there are any problems or considerations for upgrading multi-lib systems ?
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Aug 29, 2011
I'm using F15 with Gnome 3 and Gnome Shell (Default Environment).
I'm looking for some sort of solution to have different clocks (of different time zones) displayed on my desktop! Anything such as gadgets, screenlets, ...
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May 9, 2010
I have not checked for a while but did, before posting this, do a search for multi monitor support with KDE 4.4.4 and found nothing.
From what I understand 11.3 is out sometime next month and KDE 4.4.4 is the KDE environment that will be released with that iteration of SUSe.
About a month ago I read about a number of problems with multiple monitor support under 4.4.4. Primarily these issues seemed to be with no more than 2 monitors. The SUSe 11.2 machine here uses KDE 4.3 runs three monitors (Intel core quad, pair of NVidia PCIe graphics cards). I was wondering whether any of the bugs with this type of configuration have been resolved. From what I understood 4.4.4 worked with problems using Twinview but I was not able to find anything that addressed the configuration of having separate X Screens.
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Jan 20, 2010
I want to code some simple personal projects on the Unix-like partition while doing everything else on my XP partition. Can someone recommend the solution that takes up the smallest footprint in size and processing power that still delivers value? I want to learn how to code in a Unix environment.
I'm trying Cygwin but my first impression is its a bit clumsy. Would a dual boot with BeOS be better? And how would I do it? EDIT: I need to be able to run both OS'es at the same time. This is very important for me. my laptop is pretty crappy and that's why I ask for something that has a low CPU/RAM footprint.
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Mar 13, 2010
System:Asrock X58 ExtremeIntel i7 920 w/ stock cooler, HT on6GB Gskill Pi pc16000Geforce2 MX200GB Maxtor SATALite-On DVD-RW SATAOCZ 600W ModXOS: Ubunt 9.10 x64I have the CPU set to 12x multi and 150 bclock in the BIOS, which should be 1800 mhz. However Ubuntu seems to think I still have the 20x multi on.Here is the output of /proc/cpuinfo for one of the cores (no need to see it 7 more times):
Code:
processor: 0
vendor_id: GenuineIntel
[code]....
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